/Engine/Source/Runtime/MovieSceneTracks/Public/EntitySystem/Interrogation/MovieSceneInterrogationLinker.h
Allocate a new channel for a set of transform tracks that isn't bound to any particular object (but can still exist within a hierarchy)
A new interrogation channel that can be passed to ImportUnboundTrack
[FInterrogationChannel](API\Runtime\MovieScene\EntitySystem\FInterrogationChannel) AllocateUnboundChannel ( [FInterrogationChannel](API\Runtime\MovieScene\EntitySystem\FInterrogationChannel) ParentChannel, const FTransform & CurrentValueLocalSpace )